A turbofan typically has extra turbine stages to turn the fan.

This was followed by a canular combustion area and then a single turbine stage.

For additional thrust, fuel could be sprayed between the turbine stages.

The high temperature and high pressure exhaust gases then pass through the turbine stages.

The number of turbine stages can have a great effect on how the turbine blades are designed for each stage.

If combustion happens further back in the engine, the turbine stages can easily be damaged.

At the far left is a final turbine stage, shown here with a single set of vanes.

When the pressure drop available is large, it cannot all be used in one turbine stage.

Efficiencies of the turbine stages can also be plotted against this ratio.

Velocity triangles can be used to calculate the basic performance of a turbine stage.